// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_MEMORY_MEMORY_MESSAGE_FILTER_H_
#define CONTENT_BROWSER_MEMORY_MEMORY_MESSAGE_FILTER_H_

#include "base/macros.h"
#include "base/memory/memory_pressure_listener.h"
#include "content/common/content_export.h"
#include "content/public/browser/browser_message_filter.h"
#include "content/public/common/process_type.h"

namespace content {

class BrowserChildProcessHost;
class RenderProcessHost;

// This class sends memory messages from the browser process.
// See also: child_memory_message_filter.h
class CONTENT_EXPORT MemoryMessageFilter : public BrowserMessageFilter {
public:
    MemoryMessageFilter(const BrowserChildProcessHost* child_process_host,
        ProcessType process_type);
    MemoryMessageFilter(const RenderProcessHost* render_process_host);

    // BrowserMessageFilter implementation.
    void OnFilterAdded(IPC::Channel* channel) override;
    void OnChannelClosing() override;
    bool OnMessageReceived(const IPC::Message& message) override;

    void SendSetPressureNotificationsSuppressed(bool suppressed);
    void SendSimulatePressureNotification(
        base::MemoryPressureListener::MemoryPressureLevel level);
    void SendPressureNotification(
        base::MemoryPressureListener::MemoryPressureLevel level);

protected:
    friend class MemoryPressureControllerImpl;

    ~MemoryMessageFilter() override;

    const void* process_host() const { return process_host_; }
    ProcessType process_type() const { return process_type_; }

private:
    // The untyped process host and ProcessType associated with this filter
    // instance. The process host is stored as untyped because it is only used as
    // a key in MemoryPressureControllerImpl; at no point is it ever deferenced to
    // invoke any members on a process host.
    const void* process_host_;
    ProcessType process_type_;

    DISALLOW_COPY_AND_ASSIGN(MemoryMessageFilter);
};

} // namespace content

#endif // CONTENT_BROWSER_MEMORY_MEMORY_MESSAGE_FILTER_H_
